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diff --git a/src/applications/drydock/worker/DrydockLeaseUpdateWorker.php b/src/applications/drydock/worker/DrydockLeaseUpdateWorker.php
--- a/src/applications/drydock/worker/DrydockLeaseUpdateWorker.php
+++ b/src/applications/drydock/worker/DrydockLeaseUpdateWorker.php
@@ -666,6 +666,26 @@
DrydockLease $lease) {
$viewer = $this->getViewer();
+ // If this lease is marked as already in the process of reclaiming a
+ // resource, don't let it reclaim another one until the first reclaim
+ // completes. This stops one lease from reclaiming a large number of
+ // resources if the reclaims take a while to complete.
+ $reclaiming_phid = $lease->getAttribute('drydock.reclaimingPHID');
+ if ($reclaiming_phid) {
+ $reclaiming_resource = id(new DrydockResourceQuery())
+ ->setViewer($viewer)
+ ->withPHIDs(array($reclaiming_phid))
+ ->withStatuses(
+ array(
+ DrydockResourceStatus::STATUS_ACTIVE,
+ DrydockResourceStatus::STATUS_RELEASED,
+ ))
+ ->executeOne();
+ if ($reclaiming_resource) {
+ return null;
+ }
+ }
+
$resources = id(new DrydockResourceQuery())
->setViewer($viewer)
->withBlueprintPHIDs(array($blueprint->getPHID()))
diff --git a/src/applications/drydock/worker/DrydockWorker.php b/src/applications/drydock/worker/DrydockWorker.php
--- a/src/applications/drydock/worker/DrydockWorker.php
+++ b/src/applications/drydock/worker/DrydockWorker.php
@@ -241,16 +241,25 @@
DrydockLease $lease) {
$viewer = $this->getViewer();
+ // Mark the lease as reclaiming this resource. It won't be allowed to start
+ // another reclaim as long as this resource is still in the process of
+ // being reclaimed.
+ $lease->setAttribute('drydock.reclaimingPHID', $resource->getPHID());
+
// When the resource releases, we we want to reawaken this task since it
- // should be able to start building a new resource right away.
+ // should (usually) be able to start building a new resource right away.
$worker_task_id = $this->getCurrentWorkerTaskID();
$command = DrydockCommand::initializeNewCommand($viewer)
->setTargetPHID($resource->getPHID())
->setAuthorPHID($lease->getPHID())
->setCommand(DrydockCommand::COMMAND_RECLAIM)
- ->setProperty('awakenTaskIDs', array($worker_task_id))
- ->save();
+ ->setProperty('awakenTaskIDs', array($worker_task_id));
+
+ $lease->openTransaction();
+ $lease->save();
+ $command->save();
+ $lease->saveTransaction();
$resource->scheduleUpdate();

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